/* ==========================================================================
   OSSA · The Giants' Stair
   Theme: IRON SKY (custom, derived from Midnight Galaxy)
   ink #07080f · marble silver #e9edf8 · single accent molten gold #e3b46a
   Display: Iowan Old Style / Palatino · UI: Avenir Next / Gill Sans
   ========================================================================== */

:root{
  --ink:#07080f;
  --ink-2:#0b0e1b;
  --ink-3:#111629;
  --stone:#1a2036;
  --silver:#e9edf8;
  --muted:#98a1ba;
  --dim:#6f7891;
  --gold:#e3b46a;
  --gold-hi:#f8dcae;
  --gold-dim:#8c6a37;
  --ember:#c9703f;
  --line:rgba(227,180,106,.24);
  --line-soft:rgba(233,237,248,.10);
  --font-display:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;
  --font-ui:"Avenir Next","Gill Sans",Optima,"Segoe UI",sans-serif;
  --font-mono:"SF Mono",ui-monospace,"Roboto Mono",Menlo,monospace;
  --ease:cubic-bezier(.16,1,.3,1);
  --shadow-1:0 2px 8px rgba(0,0,0,.35);
  --shadow-2:0 12px 34px rgba(0,0,0,.45);
  --shadow-3:0 28px 70px rgba(0,0,0,.55);
}

*{box-sizing:border-box;margin:0;padding:0}

html{background:#05060b}
body{
  min-height:100vh;
  color:var(--silver);
  font-family:var(--font-ui);
  font-size:16px;
  line-height:1.6;
  background:
    radial-gradient(900px 520px at 18% -10%, rgba(88,74,140,.22), transparent 62%),
    radial-gradient(700px 420px at 92% 6%, rgba(201,112,63,.13), transparent 60%),
    linear-gradient(180deg,#05060b 0%,#080a13 45%,#06070d 100%);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  /* engraved grain — keeps flat gradients from looking digital */
  content:"";position:fixed;inset:0;pointer-events:none;z-index:60;opacity:.35;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='180' height='180' filter='url(%23n)' opacity='.42'/></svg>");
}
::selection{background:rgba(227,180,106,.35);color:#fff}

:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.shell{max-width:1180px;margin:0 auto;padding:22px 22px 0}

/* ---------------------------------------------------------------- stage */
.stage{
  position:relative;
  width:100%;
  aspect-ratio:16/9;
  max-height:84vh;
  overflow:hidden;
  background:#05060c;
  border:1px solid rgba(227,180,106,.20);
  box-shadow:var(--shadow-3), inset 0 0 0 1px rgba(255,255,255,.03);
  isolation:isolate;
}
.stage::before,.stage::after{
  content:"";position:absolute;width:16px;height:16px;pointer-events:none;z-index:12;
  border-color:var(--gold);border-style:solid;opacity:.75;
}
.stage::before{top:8px;left:8px;border-width:1px 0 0 1px}
.stage::after{bottom:8px;right:8px;border-width:0 1px 1px 0}

.app{position:absolute;inset:0;overflow:hidden}
canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:pointer}

/* ---------------------------------------------------------------- hud */
.hud{
  position:absolute;left:0;right:0;top:0;z-index:6;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;
  padding:14px 18px 16px;
  background:linear-gradient(180deg,rgba(4,5,11,.82) 0%,rgba(4,5,11,.45) 62%,transparent 100%);
  pointer-events:none;
  transition:opacity .3s var(--ease);
  font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);
}
.hud-left,.hud-right{display:flex;align-items:center;gap:10px;pointer-events:auto}
.hud-mid{text-align:center;line-height:1.25;min-width:0}
.hud-act{display:block;color:var(--gold);font-size:9.5px;letter-spacing:.28em}
.hud-chapter{
  display:block;font-family:var(--font-display);font-size:15px;letter-spacing:.05em;
  text-transform:none;color:var(--silver);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.hud-label{font-size:9px;letter-spacing:.24em;color:var(--dim)}

.pips{display:flex;align-items:flex-end;gap:3px;height:26px}
.pips i{
  width:7px;height:12px;display:block;border:1px solid rgba(227,180,106,.5);
  background:transparent;transform-origin:bottom;transition:background .18s var(--ease),transform .18s var(--ease),box-shadow .18s;
}
.pips i.on{
  background:linear-gradient(180deg,var(--gold-hi),var(--gold));
  box-shadow:0 0 8px rgba(227,180,106,.55);
}
.pips i.pop{transform:scaleY(1.35)}

.moon-meter{display:flex;align-items:center;gap:6px}
.moon-glyph{color:#cfd8f2;font-size:14px;line-height:1;text-shadow:0 0 10px rgba(207,216,242,.7)}
.moon-track{width:54px;height:3px;background:rgba(233,237,248,.16);overflow:hidden}
.moon-track i{display:block;height:100%;width:0%;background:linear-gradient(90deg,#b9c6ee,#fff);transition:width .25s var(--ease)}

.icon-btn{
  pointer-events:auto;cursor:pointer;min-width:34px;height:34px;padding:0 9px;
  background:rgba(10,13,24,.55);border:1px solid var(--line);color:var(--silver);
  font-family:var(--font-ui);font-size:10px;letter-spacing:.14em;text-transform:uppercase;
  transition:.18s var(--ease);
}
.icon-btn:hover{background:rgba(227,180,106,.14);border-color:var(--gold);color:var(--gold-hi)}
.icon-btn.ready{border-color:rgba(207,216,242,.65);box-shadow:0 0 12px rgba(207,216,242,.25) inset}

.progress{position:absolute;left:0;right:0;bottom:0;height:1px;background:rgba(233,237,248,.09)}
.progress i{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--gold-dim),var(--gold-hi));transition:width .2s linear}

.storm-mark{position:absolute;left:0;top:0;bottom:0;width:2px;z-index:5;pointer-events:none;opacity:0;transition:opacity .4s}
.storm-mark span{position:absolute;inset:0;background:linear-gradient(180deg,transparent,rgba(201,112,63,.8),transparent);filter:blur(1px)}
.storm-mark.on{opacity:1}

/* ---------------------------------------------------------------- screens */
.screens{position:absolute;inset:0;z-index:8;pointer-events:none}
.screen{
  position:absolute;inset:0;display:grid;place-items:center;padding:clamp(18px,4vw,44px);
  background:
    radial-gradient(120% 90% at 50% 0%,rgba(7,8,15,.55) 0%,rgba(5,6,11,.9) 62%,rgba(5,6,11,.97) 100%);
  backdrop-filter:blur(2px);
  pointer-events:auto;
  opacity:0;visibility:hidden;transform:translateY(6px);
  transition:opacity .32s var(--ease),transform .38s var(--ease),visibility .32s;
}
.screen[hidden]{display:none}
.screen.is-on{opacity:1;visibility:visible;transform:none}

.eyebrow{
  font-size:9.5px;letter-spacing:.32em;text-transform:uppercase;color:var(--gold);
  display:flex;align-items:center;gap:10px;margin-bottom:14px;
}
.eyebrow::after{content:"";height:1px;flex:1 1 24px;max-width:42px;background:linear-gradient(90deg,var(--line),transparent)}

/* title */
.screen-title{place-items:stretch;background:
  radial-gradient(90% 120% at 78% 18%,rgba(88,74,140,.22),transparent 58%),
  linear-gradient(100deg,rgba(5,6,11,.90) 0%,rgba(5,6,11,.78) 46%,rgba(5,6,11,.52) 100%);}
.title-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:clamp(18px,4vw,54px);align-items:center;height:100%}
.title-copy{max-width:600px;animation:rise .8s var(--ease) both}
.wordmark{margin:0 0 14px;line-height:.88}
.wordmark span{
  display:block;font-family:var(--font-display);font-weight:400;
  font-size:clamp(52px,9vw,104px);letter-spacing:.14em;color:var(--silver);
  text-shadow:0 0 40px rgba(227,180,106,.18);
}
.wordmark em{
  display:block;font-family:var(--font-display);font-style:italic;font-weight:400;
  font-size:clamp(15px,2.4vw,26px);letter-spacing:.06em;color:var(--gold);
  margin-top:6px;padding-left:3px;
}
.lede{font-family:var(--font-display);font-size:clamp(15px,1.7vw,20px);line-height:1.5;color:#d8dcec;max-width:36em}
.body{font-size:13.5px;line-height:1.75;color:var(--muted);margin-top:12px;max-width:38em}
.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;align-items:center}
.micro{font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);margin-top:16px}

.btn{
  appearance:none;cursor:pointer;border:1px solid transparent;border-radius:1px;
  min-height:46px;padding:0 22px;font-family:var(--font-ui);font-size:11px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;display:inline-flex;align-items:center;gap:10px;
  transition:transform .18s var(--ease),background .2s,color .2s,border-color .2s,box-shadow .2s;
  position:relative;overflow:hidden;
}
.btn:active{transform:translateY(1px)}
.btn-gold{background:linear-gradient(180deg,var(--gold-hi),var(--gold));color:#1a1409;box-shadow:0 8px 26px rgba(227,180,106,.22)}
.btn-gold:hover{box-shadow:0 10px 34px rgba(227,180,106,.34);background:linear-gradient(180deg,#fff0d4,var(--gold-hi))}
.btn-gold::after{
  content:"";position:absolute;top:0;bottom:0;left:-40%;width:30%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.55),transparent);
  transform:skewX(-18deg);transition:left .55s var(--ease);
}
.btn-gold:hover::after{left:120%}
.btn-ghost{background:transparent;color:var(--silver);border-color:rgba(233,237,248,.22)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-hi);background:rgba(227,180,106,.06)}
.btn-ghost span{color:var(--gold);font-family:var(--font-mono);letter-spacing:.05em}

/* the stone stair figure */
.title-aside{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px}
.stair-figure{position:relative;width:120px;height:230px;display:flex;flex-direction:column-reverse;align-items:center;gap:3px}
.stair-figure span{
  width:84px;height:19px;display:block;
  background:linear-gradient(180deg,#313a57,#1a2036 55%,#121729);
  border:1px solid rgba(227,180,106,.22);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.09),0 4px 10px rgba(0,0,0,.4);
  animation:stoneIn .6s var(--ease) both;
  animation-delay:calc(var(--i) * 90ms + 200ms);
  transform-origin:center bottom;
}
.stair-figure span:nth-child(odd){margin-left:6px}
.stair-figure span:nth-child(3n){margin-left:-5px}
.stair-figure .moon{display:none}
.tally{display:flex;align-items:flex-end;gap:3px;height:30px;margin-top:26px}
.tally i{width:5px;background:rgba(233,237,248,.18);display:block;border-top:1px solid rgba(227,180,106,.35)}
.tally i.done{background:linear-gradient(180deg,var(--gold-hi),var(--gold))}
.tally i.now{box-shadow:0 0 10px rgba(227,180,106,.7);background:linear-gradient(180deg,#fff2d8,var(--gold))}
.tally-cap{font-size:9.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--dim);margin-top:10px}
.aside-cap{font-family:var(--font-display);font-style:italic;font-size:12.5px;color:var(--dim);text-align:center;max-width:170px;line-height:1.5}

/* panels */
.panel-head{position:relative;width:100%;max-width:880px;padding-right:90px}
.panel-head h2,.brief-card h2,.finale-copy h2{
  font-family:var(--font-display);font-weight:400;letter-spacing:.01em;
  font-size:clamp(24px,3.6vw,38px);line-height:1.1;
}
.btn-close{position:absolute;right:0;top:0;min-height:38px;padding:0 14px;font-size:10px}

.screen-chapters{grid-template-rows:auto minmax(0,1fr) auto;gap:14px;place-items:stretch;justify-items:center;
  background:linear-gradient(180deg,rgba(5,6,11,.93),rgba(5,6,11,.99));padding-top:clamp(22px,4vh,40px)}
.chapter-scroll{width:100%;max-width:880px;overflow-y:auto;padding:4px 2px;scrollbar-width:thin}
.chapter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:8px}
.chap{
  position:relative;text-align:left;cursor:pointer;border:1px solid rgba(233,237,248,.14);
  background:linear-gradient(180deg,rgba(26,32,54,.55),rgba(11,14,27,.55));
  color:var(--silver);padding:9px 10px 10px;min-height:64px;font-family:var(--font-ui);
  transition:.18s var(--ease);
}
.chap:hover:not(:disabled){border-color:var(--gold);transform:translateY(-2px);background:rgba(227,180,106,.08)}
.chap b{display:block;font-family:var(--font-mono);font-size:16px;font-weight:500;letter-spacing:.02em}
.chap small{display:block;font-size:9px;line-height:1.25;color:var(--muted);letter-spacing:.04em;margin-top:2px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chap .s{display:flex;gap:2px;margin-top:6px;height:8px}
.chap .s i{width:6px;height:6px;border-radius:50%;background:rgba(233,237,248,.18)}
.chap .s i.on{background:var(--gold);box-shadow:0 0 6px rgba(227,180,106,.7)}
.chap:disabled{cursor:not-allowed;opacity:.34}
.chap.locked::after{content:"✦";position:absolute;right:9px;top:8px;font-size:10px;color:var(--dim)}
.chap.endless{grid-column:span 2;border-color:rgba(207,216,242,.3)}
.panel-foot{width:100%;max-width:880px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  border-top:1px solid var(--line-soft);padding-top:14px}
.panel-foot p{font-size:11.5px;color:var(--dim);max-width:34em}
.panel-foot strong{color:var(--gold);font-weight:600}

.brief-card{
  width:min(560px,100%);padding:clamp(22px,4vw,38px);
  background:linear-gradient(165deg,rgba(17,22,41,.94),rgba(8,10,20,.96));
  border:1px solid var(--line);box-shadow:var(--shadow-3);
  position:relative;
  animation:rise .5s var(--ease) both;
}
.brief-card::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent);opacity:.7}
.brief-card.compact{width:min(470px,100%)}
.brief-story{font-size:13.5px;line-height:1.75;color:var(--muted);margin:14px 0 4px;max-width:44em}
.brief-facts{display:flex;gap:26px;flex-wrap:wrap;margin:20px 0 4px;border-top:1px solid var(--line-soft);padding-top:16px}
.brief-facts dt,.result-stats dt{font-size:9px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim)}
.brief-facts dd{font-family:var(--font-mono);font-size:14px;color:var(--silver);margin-top:3px}

.result-card{width:min(600px,100%)}
.stars{display:flex;gap:8px;margin:16px 0 2px}
.stars i{
  width:20px;height:20px;display:block;transform:rotate(45deg);
  border:1px solid rgba(227,180,106,.45);background:transparent;
  transition:.35s var(--ease);
}
.stars i.on{background:linear-gradient(135deg,var(--gold-hi),var(--gold));box-shadow:0 0 18px rgba(227,180,106,.6);border-color:var(--gold)}
.result-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:20px 0 2px;
  border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);padding:14px 0}
.result-stats div dd{font-family:var(--font-mono);font-size:15px;color:var(--gold-hi);margin-top:4px}

.screen-finale{background:radial-gradient(80% 80% at 50% 60%,rgba(18,24,48,.6),rgba(4,5,10,.96))}
.finale-copy{text-align:center;max-width:620px;animation:rise .9s var(--ease) both}
.finale-copy h2{font-size:clamp(28px,5vw,52px);margin-bottom:16px;color:var(--gold-hi)}
.finale-copy p{color:var(--muted);font-family:var(--font-display);font-size:16px;line-height:1.7}
.finale-copy .btn{margin-top:26px}

/* touch control */
.touch{position:absolute;inset:0;z-index:7;pointer-events:none;display:none}
.touch-leap{
  pointer-events:auto;position:absolute;right:16px;bottom:16px;width:76px;height:76px;border-radius:50%;
  border:1px solid rgba(227,180,106,.55);background:radial-gradient(circle at 40% 35%,rgba(227,180,106,.28),rgba(10,13,24,.5));
  color:var(--gold-hi);font-size:10px;letter-spacing:.2em;text-transform:uppercase;
}
.app.touch-on .touch{display:block}

/* ---------------------------------------------------------------- prose */
.prose{
  display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:clamp(24px,4vw,54px);
  padding:clamp(40px,6vw,74px) 0 30px;
}
.prose-main{max-width:720px;min-width:0}
.prose-h1{font-family:var(--font-display);font-weight:400;font-size:clamp(26px,3.4vw,40px);line-height:1.15;letter-spacing:-.005em;margin-bottom:14px}
.prose .lede{color:var(--gold-hi);font-size:clamp(15px,1.5vw,18px);margin-bottom:22px}
.prose p{font-size:15px;line-height:1.78;color:#b9c1d6;margin:14px 0}
.prose strong{color:var(--silver);font-weight:600}
.prose em{color:var(--gold-hi);font-style:italic}
.prose h2{
  font-family:var(--font-display);font-weight:400;font-size:clamp(20px,2.4vw,27px);
  margin:40px 0 12px;padding-top:20px;border-top:1px solid var(--line-soft);letter-spacing:.01em;
}
.prose h2::before{content:"◇";color:var(--gold);font-size:11px;vertical-align:3px;margin-right:9px;opacity:.8}
.steps{margin:10px 0 0;padding-left:0;list-style:none;counter-reset:s}
.steps li{
  counter-increment:s;position:relative;padding:9px 0 9px 40px;font-size:14.5px;line-height:1.72;color:#b9c1d6;
  border-bottom:1px solid rgba(233,237,248,.05);
}
.steps li::before{
  content:counter(s,upper-roman);position:absolute;left:0;top:9px;width:26px;text-align:right;
  font-family:var(--font-mono);font-size:11px;color:var(--gold);letter-spacing:.04em;
}
.prose table{width:100%;border-collapse:collapse;margin:16px 0 6px;font-size:13.5px}
.prose th,.prose td{text-align:left;vertical-align:top;padding:9px 10px;border-bottom:1px solid rgba(233,237,248,.08)}
.prose th{font-size:9.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);font-weight:500;white-space:nowrap}
.prose td{color:#aeb7cd}
.prose td:first-child{color:var(--silver)}
kbd{
  font-family:var(--font-mono);font-size:11px;color:var(--silver);
  background:rgba(233,237,248,.08);border:1px solid rgba(233,237,248,.18);border-radius:3px;padding:2px 6px;
}
.faq h3{font-family:var(--font-display);font-weight:400;font-size:16.5px;color:var(--gold-hi);margin:22px 0 6px}
.faq p{margin:0 0 6px;font-size:14px;color:#aeb7cd}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin:34px 0 14px}
.tag{
  font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);
  border:1px solid rgba(227,180,106,.28);padding:5px 10px;background:rgba(227,180,106,.05);
}
.src{font-size:11.5px;color:var(--dim);display:flex;gap:10px;flex-wrap:wrap}
.src a{color:var(--gold);text-decoration:none;border-bottom:1px solid rgba(227,180,106,.3)}
.src a:hover{color:var(--gold-hi)}

.prose-aside{position:relative;min-width:0}
.fact-card{
  border:1px solid var(--line-soft);border-top-color:var(--line);
  background:linear-gradient(180deg,rgba(17,22,41,.5),rgba(8,10,20,.35));
  padding:18px 18px 16px;margin-bottom:12px;
}
.fact-card .eyebrow{margin-bottom:12px;font-size:8.5px}
.fact-card dl div{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-bottom:1px solid rgba(233,237,248,.06)}
.fact-card dt{font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}
.fact-card dd{font-size:12.5px;color:var(--silver);text-align:right}
.aside-quote{font-family:var(--font-display);font-style:italic;font-size:15px;line-height:1.6;color:var(--gold-hi)}
.aside-body{font-size:12.5px;line-height:1.7;color:var(--muted)}

.foot{
  max-width:1180px;margin:0 auto;padding:26px 22px 46px;border-top:1px solid var(--line-soft);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:11px;color:var(--dim);
}
.foot a{color:var(--muted);text-decoration:none}
.foot a:hover{color:var(--gold)}

/* ---------------------------------------------------------------- motion */
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@keyframes stoneIn{from{opacity:0;transform:translateY(12px) scaleX(.8)}to{opacity:1;transform:none}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}

/* ---------------------------------------------------------------- responsive */
@media (max-width:900px){
  .shell{padding:14px 12px 0}
  .prose{grid-template-columns:1fr;gap:22px}
  .prose-aside{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .fact-card{margin:0}
  .title-grid{grid-template-columns:1fr}
  .title-aside{display:none}
  .hud{gap:8px;padding:10px 12px 12px}
  .hud-label{display:none}
  .hud-chapter{font-size:13px}
  .moon-track{width:38px}
  .icon-btn{min-width:30px;height:30px;padding:0 6px;font-size:9px}
  .result-stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-aspect-ratio:1/1){
  .stage{aspect-ratio:3/4;max-height:78vh}
}
@media (max-width:430px){
  .hud-mid{display:none}
  .hud{grid-template-columns:auto 1fr}
  .hud-right{justify-self:end}
}
@media (max-width:560px){
  .screen{padding:14px}
  .wordmark span{font-size:clamp(46px,15vw,72px);letter-spacing:.1em}
  .lede{font-size:14.5px}
  .body{font-size:12.5px}
  .cta-row .btn{flex:1 1 auto;justify-content:center;padding:0 14px}
  .chapter-grid{grid-template-columns:repeat(auto-fill,minmax(78px,1fr))}
  .prose-aside{grid-template-columns:1fr}
  .prose table{display:block;overflow-x:auto}
  .hud-mid{text-align:right}
  .hud-chapter{max-width:42vw}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-delay:0ms !important;transition-duration:.001ms !important}
}